Characterization of mycobacterial virulence genes through genetic interaction mapping

UMMS Affiliation

Department of Molecular Genetics and Microbiology

Publication Date


Document Type



Animals; Bacterial Proteins; Chromosome Mapping; DNA Transposable Elements; *Genes, Bacterial; Mice; Mice, Inbred C57BL; Molecular Sequence Data; Mycobacterium tuberculosis; Reproducibility of Results; Tuberculosis; Virulence


Life Sciences | Medicine and Health Sciences


We have previously shown that approximately 5% of the genes encoded by the genome of Mycobacterium tuberculosis are specifically required for the growth or survival of this bacterium during infection. This corresponds to hundreds of genes, most of which have no identifiable function. As a unique approach to characterize these genes, we developed a method to rapidly delineate functional pathways by identifying mutations that modify each other's phenotype, i.e., "genetic interactions". Using this method, we have defined a complex set of interactions between virulence genes in this pathogen, and find that the products of unlinked genes associate to form multisubunit transporters that are required for bacterial survival in the host. These findings implicate a previously undescribed family of transport systems in the pathogenesis of tuberculosis, and identify genes that are likely to function in the metabolism of their substrates. This method can be readily applied to other organisms at either the single pathway level, as described here, or at the system level to define quantitative genetic interaction networks.

DOI of Published Version



Proc Natl Acad Sci U S A. 2006 Aug 1;103(31):11760-5. Epub 2006 Jul 25. Link to article on publisher's site

Journal/Book/Conference Title

Proceedings of the National Academy of Sciences of the United States of America

Related Resources

Link to Article in PubMed

PubMed ID